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<td ><a href="../qtdoc/index.html">Qt 5.12</a></td><td ><a href="qtquick-index.html">Qt Quick 模块</a></td><td ><a href="qtquick-qmlmodule.html">QML类型</a></td><td >TouchPoint QML 类型</td></tr></table><table class="buildversion"><tr>
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<h3><a name="toc">目录</a></h3>
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<li class="level1"><a href="#properties">属性</a></li>
<li class="level1"><a href="#details">详细信息</a></li>
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<h1 class="title">TouchPoint QML 类型</h1>
<span class="subtitle"></span>
<!-- $$$TouchPoint-brief -->
<p>Describes a touch point in a <a href="qml-qtquick-multipointtoucharea.html">MultiPointTouchArea</a>. <a href="#details">更多...</a></p>
<!-- @@@TouchPoint -->
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> 导入语句：</td><td class="memItemRight bottomAlign"> import QtQuick 2.12</td></tr></table></div><ul>
<li><a href="qml-qtquick-touchpoint-members.html">所有成员的列表，包括继承成员</a></li>
<li><a href="qml-qtquick-touchpoint-obsolete.html">废弃的成员</a></li>
</ul>
<a name="properties"></a>
<h2 id="properties">属性</h2>
<ul>
<li class="fn"><b><b><a href="qml-qtquick-touchpoint.html#ellipseDiameters-prop">ellipseDiameters</a></b></b> : size</li>
<li class="fn"><b><b><a href="qml-qtquick-touchpoint.html#pointId-prop">pointId</a></b></b> : int</li>
<li class="fn"><b><b><a href="qml-qtquick-touchpoint.html#pressed-prop">pressed</a></b></b> : bool</li>
<li class="fn"><b><b><a href="qml-qtquick-touchpoint.html#pressure-prop">pressure</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtquick-touchpoint.html#previousX-prop">previousX</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtquick-touchpoint.html#previousY-prop">previousY</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtquick-touchpoint.html#rotation-prop">rotation</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtquick-touchpoint.html#sceneX-prop">sceneX</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtquick-touchpoint.html#sceneY-prop">sceneY</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtquick-touchpoint.html#startX-prop">startX</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtquick-touchpoint.html#startY-prop">startY</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtquick-touchpoint.html#uniqueId-prop">uniqueId</a></b></b> : PointingDeviceUniqueId</li>
<li class="fn"><b><b><a href="qml-qtquick-touchpoint.html#velocity-prop">velocity</a></b></b> : vector2d</li>
<li class="fn"><b><b><a href="qml-qtquick-touchpoint.html#x-prop">x</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtquick-touchpoint.html#y-prop">y</a></b></b> : real</li>
</ul>
<!-- $$$TouchPoint-description -->
<a name="details"></a>
<h2 id="details">详细信息</h2>
<p>The <a href="qml-qtquick-touchpoint.html">TouchPoint</a> type contains information about a touch point, such as the current position, pressure, and area.</p>
<p class="centerAlign"><img src="images/touchpoint-metrics.png" alt="" /></p><!-- @@@TouchPoint -->
<h2>属性文档</h2>
<!-- $$$ellipseDiameters -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="ellipseDiameters-prop">
<td class="tblQmlPropNode"><p>
<a name="ellipseDiameters-prop"></a><span class="name">ellipseDiameters</span> : <span class="type"><a href="../qtqml/qml-size.html">size</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the major and minor axes of the ellipse representing the covered area of the touch point.</p>
<p>This property was introduced in  Qt 5.9.</p>
</div></div><!-- @@@ellipseDiameters -->
<br/>
<!-- $$$pointId -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="pointId-prop">
<td class="tblQmlPropNode"><p>
<a name="pointId-prop"></a><span class="name">pointId</span> : <span class="type"><a href="../qtqml/qml-int.html">int</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the point id of the touch point.</p>
<p>Each touch point within a <a href="qml-qtquick-multipointtoucharea.html">MultiPointTouchArea</a> will have a unique id.</p>
</div></div><!-- @@@pointId -->
<br/>
<!-- $$$pressed -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="pressed-prop">
<td class="tblQmlPropNode"><p>
<a name="pressed-prop"></a><span class="name">pressed</span> : <span class="type"><a href="../qtqml/qml-bool.html">bool</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds whether the touch point is currently pressed.</p>
</div></div><!-- @@@pressed -->
<br/>
<!-- $$$pressure -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="pressure-prop">
<td class="tblQmlPropNode"><p>
<a name="pressure-prop"></a><span class="name">pressure</span> : <span class="type"><a href="../qtqml/qml-real.html">real</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>These properties hold additional information about the current state of the touch point.</p>
<ul>
<li><code>pressure</code> is a value in the range of 0.0 to 1.0&#x2e;</li>
<li><code>velocity</code> is a vector with magnitude reported in pixels per second.</li>
</ul>
<p>Not all touch devices support velocity. If velocity is not supported, it will be reported as 0,0.</p>
</div></div><!-- @@@pressure -->
<br/>
<!-- $$$previousX -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="previousX-prop">
<td class="tblQmlPropNode"><p>
<a name="previousX-prop"></a><span class="name">previousX</span> : <span class="type"><a href="../qtqml/qml-real.html">real</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>These properties hold the previous position of the touch point.</p>
</div></div><!-- @@@previousX -->
<br/>
<!-- $$$previousY -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="previousY-prop">
<td class="tblQmlPropNode"><p>
<a name="previousY-prop"></a><span class="name">previousY</span> : <span class="type"><a href="../qtqml/qml-real.html">real</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>These properties hold the previous position of the touch point.</p>
</div></div><!-- @@@previousY -->
<br/>
<!-- $$$rotation -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="rotation-prop">
<td class="tblQmlPropNode"><p>
<a name="rotation-prop"></a><span class="name">rotation</span> : <span class="type"><a href="../qtqml/qml-real.html">real</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the angular orientation of this touch point. The return value is in degrees, where zero (the default) indicates the finger or token is pointing upwards, a negative angle means it's rotated to the left, and a positive angle means it's rotated to the right. Most touchscreens do not detect rotation, so zero is the most common value.</p>
<p>This property was introduced in  Qt 5.9.</p>
<p><b>请参考 </b><a href="../qtgui/qtouchevent-touchpoint.html#rotation">QTouchEvent::TouchPoint::rotation()</a>。</p>
</div></div><!-- @@@rotation -->
<br/>
<!-- $$$sceneX -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="sceneX-prop">
<td class="tblQmlPropNode"><p>
<a name="sceneX-prop"></a><span class="name">sceneX</span> : <span class="type"><a href="../qtqml/qml-real.html">real</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>These properties hold the current position of the touch point in scene coordinates.</p>
</div></div><!-- @@@sceneX -->
<br/>
<!-- $$$sceneY -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="sceneY-prop">
<td class="tblQmlPropNode"><p>
<a name="sceneY-prop"></a><span class="name">sceneY</span> : <span class="type"><a href="../qtqml/qml-real.html">real</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>These properties hold the current position of the touch point in scene coordinates.</p>
</div></div><!-- @@@sceneY -->
<br/>
<!-- $$$startX -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="startX-prop">
<td class="tblQmlPropNode"><p>
<a name="startX-prop"></a><span class="name">startX</span> : <span class="type"><a href="../qtqml/qml-real.html">real</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>These properties hold the starting position of the touch point.</p>
</div></div><!-- @@@startX -->
<br/>
<!-- $$$startY -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="startY-prop">
<td class="tblQmlPropNode"><p>
<a name="startY-prop"></a><span class="name">startY</span> : <span class="type"><a href="../qtqml/qml-real.html">real</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>These properties hold the starting position of the touch point.</p>
</div></div><!-- @@@startY -->
<br/>
<!-- $$$uniqueId -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="uniqueId-prop">
<td class="tblQmlPropNode"><p>
<a name="uniqueId-prop"></a><span class="name">uniqueId</span> : <span class="type">PointingDeviceUniqueId</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the unique ID of the touch point or token.</p>
<p>It is normally empty, because touchscreens cannot uniquely identify fingers. But when it is set, it is expected to uniquely identify a specific token (fiducial object).</p>
<p>Interpreting the contents of this ID requires knowledge of the hardware and drivers in use (e.g&#x2e; various TUIO-based touch surfaces).</p>
<p>This property was introduced in  Qt 5.9.</p>
</div></div><!-- @@@uniqueId -->
<br/>
<!-- $$$velocity -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="velocity-prop">
<td class="tblQmlPropNode"><p>
<a name="velocity-prop"></a><span class="name">velocity</span> : <span class="type"><a href="qml-vector2d.html">vector2d</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>These properties hold additional information about the current state of the touch point.</p>
<ul>
<li><code>pressure</code> is a value in the range of 0.0 to 1.0&#x2e;</li>
<li><code>velocity</code> is a vector with magnitude reported in pixels per second.</li>
</ul>
<p>Not all touch devices support velocity. If velocity is not supported, it will be reported as 0,0.</p>
</div></div><!-- @@@velocity -->
<br/>
<!-- $$$x -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="x-prop">
<td class="tblQmlPropNode"><p>
<a name="x-prop"></a><span class="name">x</span> : <span class="type"><a href="../qtqml/qml-real.html">real</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>These properties hold the current position of the touch point.</p>
</div></div><!-- @@@x -->
<br/>
<!-- $$$y -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="y-prop">
<td class="tblQmlPropNode"><p>
<a name="y-prop"></a><span class="name">y</span> : <span class="type"><a href="../qtqml/qml-real.html">real</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>These properties hold the current position of the touch point.</p>
</div></div><!-- @@@y -->
<br/>
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